the united states won 98 medals, coming in 6th. overall. >>> and still ahead, out of the blue, something unusual fell from the sky, shocking one neighborhood near seattle and puzzling investigators tonight. >>> plus, the aftermath of wild weather on the east coast. and tomorrow, there will be no class for students in the nation's third largest school district. more than 26,000 teachers are going on strike. ♪ [ man ] excuse me miss. [ gasps ] this fiber one 90 calorie brownie has all the moist, chewy, deliciousness you desire. mmmm. thanks. [ man ] at 90 calories, the brownie of your dreams is now deliciously real. [ female announcer ] and now, try our new chocolate chip cookie 90 calorie brownie. >>> welcome back, i'm diane dwyer. well, today marks the second anniversary of the massive pg&e explosion in san bruno. the officials held a memorial at a park nearby. but some neighbors who survived the fire did not attend. arturo santiago has more. >> reporter: the city wanted to have the memorial at city park because it has a sculptur